Ignition Delays of Blended Unsymmetrical Dimethyl Hydrazine with an Energetic Ionic Liquid

摘要

An experimental investigation of hypergolicity and ignition delays of blends of hydroxyethylhydrazinium nitrate (HEHN) and unsymmetrical dimethyl hydrazine (UDMH) with white fuming nitric acid (WFNA) and red fuming nitric acid (RFNA) has been presented. HEHN by itself was found to be non-hypergolic in combination with RFNA and WFNA under ambient conditions. However, UDMH-HEHN blends containing a minimum of 30% and 40% UDMH by weight were found to be hypergolic with the same oxidizer. Tests were conducted to measure the ignition delays in a drop test setup equipped sequentially with a high-speed camera as well as an optoelectronic circuit. The effects of UDMH concentration on ignition delays in HEHN-UDMH blends were studied. The physical and chemical ignition delays were segregated with the use of the optoelectronic circuit. The ignition delays and viscosities were found to reduce as the percentage of UDMH in HEHN was increased. The hypergolic blend containing 50% UDMH was found to be the best candidate for replacement of UDMH owing to its low ignition delay with RFNA. The density of this blend was approximately 40% higher than UDMH, making it advantageous for volume limited applications.